1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
7 * Definitions for the IP protocol.
9 * Version: @(#)ip.h 1.0.2 04/28/93
11 * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
16 #include <linux/skbuff.h>
17 #include <uapi/linux/ip.h>
19 static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
21 return (struct iphdr *)skb_network_header(skb);
24 static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
26 return (struct iphdr *)skb_inner_network_header(skb);
29 static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
31 return (struct iphdr *)skb_transport_header(skb);
34 static inline unsigned int ip_transport_len(const struct sk_buff *skb)
36 return ntohs(ip_hdr(skb)->tot_len) - skb_network_header_len(skb);
38 #endif /* _LINUX_IP_H */